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Built for STEM educators

Build once. Teach forever.
Record effortlessly.

The teaching whiteboard where structured content and live explanation never mix. Left side reveals what you've prepared. Right side is always a clean canvas.

Open Editor See Features
Free · No account required · Works offline
Notebook App — Build Mode
Random Experiment & Sample Space
CONCEPT
A random experiment is a process whose outcome is uncertain but well-defined...
FORMULA
S = {all possible outcomes}
WARNING
Discrete vs Continuous — GATE tests discrete probability in early questions...

Three modes. One tool.

Content and live thinking should never share the same space.

Build

CONCEPT — Rich text blocks
FORMULA — KaTeX math
CODE — Syntax highlighting

Create structured STEM content with specialized blocks — concepts, formulas with KaTeX, code, GATE Q&A with solutions, warnings, examples.

  • 7 block types
  • LaTeX formula editor with 200+ symbols
  • AI content import
  • Status tracking (todo/wip/done)

Teach

◀ 2 / 6 ▶
Block reveal...
Canvas

Split view: left reveals blocks one-by-one, right is a fresh canvas every session. Students see the thinking happen live.

  • Block-by-block reveal
  • Focus mode (spotlight)
  • Full board mode
  • Resizable split pane
  • Multi-board per page
  • Lecture timer

Present

Fullscreen content...
12:34▰▰▰▱▱ 3/5

Fullscreen reveal mode with timer. Screen record + microphone = instant YouTube video. No slide duplication for animations.

  • Clean fullscreen UI
  • Elapsed timer
  • Keyboard navigation
  • 40-50% shorter recordings

Professional whiteboard. Zero cost.

Every feature from expensive tools — built in, no license fees, works offline.

Pressure pen

Variable-width strokes with EMA smoothing

Shape auto-correct

Draw rough — get clean lines, rectangles, circles

Zoom & pan

Scroll zoom, space+drag pan, pinch on touch

Laser pointer

Fading red trail for re-explaining without rewriting

Multi-board

Multiple boards per page — flip like physical chalkboards

Paper types

Dot grid, lined, graph, isometric backgrounds

Right-click menu

Full context menu with tools, export, and settings

Auto-save

Every stroke saved to localStorage instantly

Built by an educator, for educators

Coaching center teachers

Pen → assistant types → PPT

Create once in the tool you teach from. No assistant needed.

Save ₹10,000/mo assistant cost

YouTube STEM educators

Tablet + scrcpy + OBS + CapCut + slide duplication

Present mode + screen record = done. No video editing for reveals.

40-50% shorter recording time

GATE/competitive exam students

Theory, PYQs, practice problems scattered across 3 places

One notebook: theory → practice → PYQs with GateOverflow links.

Everything in one structured place

BUILT WITH

Next.jsTypeScriptTailwind CSSKaTeXZustandPWA

Start teaching better today

Free. No signup. Works offline. Your data stays on your device.

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